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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1b9292136796898a3d2cc2116db9802c25cf989696564af2aa49ffec4677a04' 
  AND token = 'C4EuwzHPeGnHPCGFQ98tjF2M8HiGlL53lm9u9wz3AUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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