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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a2fdaea08472ede210ea7b503a0fbe5211dc812db48b4ccf5ea9034fd6aa18b' 
  AND token = 'S4/tLS08x3EIafpKC65YCG+I5tIcdCNlJGUkBhSsduQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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