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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e92ced1a8c2cbede01baf0edf70fef0cb0676ae7f5d4b84535a7279445bffb0f' 
  AND token = 'ZaU6z3N63ElcUCpGI7I/l68IsvNv3i38Z8jo3FLTmRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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