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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f49252f75470fa23292a08878ae78623040963d4a1d1fa1f6e68533c5ed041fc' 
  AND token = 'eCyAcyxnonqpwsMlMNOXVCYzcxQ9ykMA6gr0z30QB7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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