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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e3a21f0eafc06d726c05a1252eb3f67a6e795284ef48622968ca64de3e69038' 
  AND token = 'KX7JaVJ3fAlhmIdzgI1t5bMeV3ebXHbz8UIkOoVr9x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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