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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f43ed8ca7c4c573fbd8405defd9a62be6c83f467e6ad49f9ded1b2d39ce67e16' 
  AND token = 'Rjmwd3JxC1FYp7j0NM2UijMH4q2uzH72nnwSuIp2aqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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