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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc3f98cdc16d5adc63203e7f163f7f5fe0072a3ec16ca9e2e4171f30394e44cd' 
  AND token = '8lf17UxkySCjs9pePWMfFZUQWi72nHV3yJ0xTffYoRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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