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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '008730130a0f49c858bd7d9c46db7e966bf6a856bbfa645244986c44ccf8603b' 
  AND token = 'b8HF3SE4GZJmi47ZW1OIdc2SGmSsSoD2osyJglAMtp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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