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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f38fca7f74538abce4ab471ef21c405407de74a4bbfef9dc319be40aa29523b' 
  AND token = 'HJ4iSlRLUTie3i7l3obUuNZntDk/DAs8EdWozhkqlyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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