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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83a14a62c2297dc2e8776a6e9a2fcd25eeb8188b7156ad3378dc2f16df76e25e' 
  AND token = 'a++UH/ZNDsCMFiyqOubxZ4mp3skyXIcpY5rdwADigV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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