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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b778b5adb9e4a1864b6adec810f5786e1e180be8603f5c6de778617be26909e3' 
  AND token = 'bP3Kui95eVBjMCNiWgIRs2v4qbflwDoZB5ou0XcCEVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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