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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2a4ebd6a9a7035db94ea1deb6ce2eb7360609ba09eacfab1e05220aab2e86c1' 
  AND token = 'q7dasQ798ETEmweHRRtf6Dna56r1IRSeji1Rr/jCRKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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