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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eadd01171d61aa3126e4d96dab65edac67e172af6bbb456936f881c7c21bc2d1' 
  AND token = 'Lg4rOc89deDnop2gVb1RH4SoIKtmtclno+/cPrrKDGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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