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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0f26644c92fdbb72b53a4ce7506c0a0b73b52be7db46688fdd7953a2e59823f' 
  AND token = 'jgkRtfqyWpDPOdLo62O5wdfrYRpp09AHcgCy88FRadk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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