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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bd23907fa2d997cc238cabe22fe063eb43782814a38c03ffeb92572827943b6' 
  AND token = 'fc/OYZs1FDMV1VFUaavtAzxdPVQXcOgyg3eiK93nuT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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