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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e4613f8a932afc6d1d2b0c10b68b54e847cfca8c6a2216bb56a9e7791867bb8' 
  AND token = 'LWyRWbjgEH13ASNU2SbhtL/bsGYwbyGzp826+s3Vp94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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