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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bbbe9ab05f5354ea607970f229c5529a7239c6a16df268dda4e24c5ca1098b6' 
  AND token = 'W6j3v5OmiDP9aT3+RHvUamJqBFdHPMjHPXxPMJeHK8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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