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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84d73950eca0ef9ed10e23dd3006323025e4de788839cb9f2df937f3adf2c52c' 
  AND token = 'T8OuuUp45wAIlZ28Kp75Wrd9bz+3g4oVYARLjvFsJj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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