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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a9aec44a631c33a459d86b299e77426ff98da5a917635a856fb5f985da8b2fb' 
  AND token = 'RN6rtE5OY7wz8Ub9cJdY1Ib/bltF4SytsK/1Lxcyr+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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