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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5732442477ea319cf04fe71ea0c7147a1d85c3353150ab677eb43b6f47df4e3c' 
  AND token = 'c93dYeI6nAfo9Q4uxWQ3ueYKuH4daSK4pyN+n3pR6yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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