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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cceaff2b77e0d14ab0a6583abfb9af05bb93c62212fdea0976606d96407e8184' 
  AND token = 'eQNwhCARDV4PfirP8EyykXg6864SRlsaz+n6Jx6KLHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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