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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c3ad2e38002fe3cd24f8d17e927e0af884b41dabe3dac7ab89d721a7d89c754' 
  AND token = 'qQr6vjCbji3YXJjys/3MEvCg7IK/CLmKdvi6AcbO1P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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