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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d1fbc79c5d1ea15ae43d447aa024dfdfe2a5bf3a6c5e5f7457e150eb1810b0a' 
  AND token = 'tmFK2Y+faFgNMLMLIt6Rg2YtkDMBnd9cEvX7kVNw6Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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