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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9744eb6e284d1d2b2f52ecb03a1d1454be83d54b5000ee36f9ea145c77a81983' 
  AND token = 'QlZX7QGXTYmgK4Bt55pjuivpbnl2EHrcmt1k1SvTBzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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