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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af97e719c7977e9bbf3343e396afba91914d33a376362b594d74d1434e034beb' 
  AND token = 'DKlzHJBiW9VQIR/dBFBiarjDOWB7O9udi7ippHnqntk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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