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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a155a52ae3c08d571ecebe62c6ba82f4bb3c9b66d89a9c3329ef7553d1a9099' 
  AND token = 'zvegNeMyDf8rcwA3C+Wu4NqP/pN3Gol3fnH2jUE5KVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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