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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7ede33ba4ac0dd2936e84439455f3b1250152a7cbdb747ba49efac2a2881552' 
  AND token = 'mh2h1l+1yZPuxQihh4ZxoYMuNvENeRhvnHKdxHUG9L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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