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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2138ad6ed986ebeb719acfb82305d68c603e6f92b7def3894d4b44cf30c8f4d' 
  AND token = '8odUdRtKoD29RreQgbqe1u1Hkrm/RQIFUolDdopv4no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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