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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ee80b1d077476038843796396e379f63dfd1ee11b8819ba1e373b2a58a97752' 
  AND token = 'ElTJUj8BAXoS5WIw3rgqH9iLliL912R8Uu66vB/NnkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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