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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc58793b868114ba99928fa626aa242baca6f2be84f6e2639feec8af98b056c0' 
  AND token = '1YTSkQZH/aLyjZbYp+ttb/eIGFmH4LUzB+19pyT1ztk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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