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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c58e115ef15e12d0f2fa99dcf9ec10168830469d0d1d1fa982be5ee498117c5' 
  AND token = 'Oj+/tMZ21Rr9QU4Q05LZbZpZYgcLSHQjL34pRbEW8Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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