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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5e987a1ec8f6b755045b50bc05b82bfdbef9b21594419d2635dd216ea3d5414' 
  AND token = 'qoymxOn2hfVujKfamfKtfAFFgV6Ttey4/VvFWW5goZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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