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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37afab799b966aacc9f4ce4dcc80d4d7f606571aecb3cd610db34bf3c06e13a9' 
  AND token = 'Ol3Ys32SFKo7XIqoMlNo+oo5yKj+94bqqr+DolpymmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}